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Development of a frequency-dependent composite load model using the measurement approach

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6 Author(s)
Jin-Cheng Wang ; Sch. of Electr. Eng., Cornell Univ., Ithaca, NY, USA ; Hsiao-Dong Chiang ; Chung-Liang Chang ; Ah-Hsing Liu
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In control and stability studies, load models should realistically represent the aggregate load behavior of all kinds of individual components. In this paper, the development of a composite load model, where the load is represented as a combination of an RC circuit in parallel with an induction motor equivalent circuit, is presented. A procedure is developed for identifying a frequency-dependent composite load model using digital measurements from an on-line transient recording system, taking account of system frequency variation. A nonlinear model parameter estimation technique is described to derive the frequency-dependent load model. A computer program called LMSP has been developed. The program consists of five major phases: user-interface, data manipulation, load model identification; model conversion and system model response evaluation. A case study is presented to illustrate, in particular, the accuracy of the developed model for the representation of dynamic load behaviors of an actual power system

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Power Systems, IEEE Transactions on  (Volume:9 ,  Issue: 3 )